"""Phase 1 spec tests for ADR-0065 P2 — composite emit-time validation.

Covers the two reachable invariants enforced by the TLContext lowering pass
(ADR-0065 D6.6 / D6.7):

- **Auto-bind conflict (D6.6).** If a prologue recipe declares a
  `primary_out` (which auto-binds into the head GEMM's `a`) AND the kernel
  also passes `a` explicitly, lowering raises — ambiguous which value wins.
- **MATH operand TCM-only (D6.7).** Every operand of a *prologue recipe*
  MATH op must be TCM-resident; passing an HBM handle as a recipe operand
  raises at emit time. (The head op — gemm *or* math — keeps the existing
  DMA-staged-from-HBM behavior; D6.7 does not apply to it.)

(D6.1 GEMM-count ≤ 1 is implemented as a defensive guard but is not
reachable through the public API while `softmax_merge` is MATH-only and the
head carries a single GEMM — its dedicated test is deferred until a
GEMM-emitting recipe exists.)

Phase 1 (this commit): tests only. FAIL until P2.
"""
from __future__ import annotations

import math

import pytest

from kernbench.common.pe_commands import TensorHandle
from kernbench.triton_emu.tl_context import TLContext

G, TILE, D = 8, 64, 128


def _tcm(addr: int, shape: tuple[int, ...]) -> TensorHandle:
    return TensorHandle(
        id=f"h{addr:x}", addr=addr, shape=shape, dtype="f16",
        nbytes=2 * math.prod(shape), space="tcm",
    )


def _hbm(addr: int, shape: tuple[int, ...]) -> TensorHandle:
    return TensorHandle(
        id=f"hb{addr:x}", addr=addr, shape=shape, dtype="f16",
        nbytes=2 * math.prod(shape), space="hbm",
    )


def test_autobind_conflict_raises(monkeypatch=None):
    """D6.6 — explicit `a` + a primary_out recipe is ambiguous."""
    tl = TLContext(pe_id=0, num_programs=1, scratch_base=0x100000)
    A = _tcm(0x9000, (G, TILE))
    s = _tcm(0x1000, (G, TILE))
    m = _tcm(0x2000, (G,))
    l = _tcm(0x3000, (G,))
    O = _tcm(0x4000, (G, D))
    V = tl.ref(0x5000, shape=(TILE, D), dtype="f16")
    with pytest.raises(ValueError, match="auto-bind"):
        tl.composite(
            op="gemm", a=A, b=V, out=O,
            prologue=[{"op": "softmax_merge", "s": s, "m": m, "l": l, "O": O}],
        )


def test_math_operand_must_be_tcm_raises():
    """D6.7 — an HBM handle reaching a prologue recipe MATH op is rejected.

    softmax_merge's first op (rmax) reads ``s``; an HBM ``s`` makes the
    expanded MATH op reference HBM, which the recipe prohibits.
    """
    tl = TLContext(pe_id=0, num_programs=1, scratch_base=0x100000)
    s_hbm = _hbm(0x1000, (G, TILE))     # Sj as HBM — illegal recipe operand
    m = _tcm(0x2000, (G,))
    l = _tcm(0x3000, (G,))
    O = _tcm(0x4000, (G, D))
    V = tl.ref(0x5000, shape=(TILE, D), dtype="f16")
    with pytest.raises(ValueError, match="TCM"):
        tl.composite(
            op="gemm", b=V, out=O,
            prologue=[{"op": "softmax_merge", "s": s_hbm, "m": m, "l": l, "O": O}],
        )


def test_math_head_from_hbm_is_allowed():
    """The head op (op="math") keeps the existing HBM-streamed behavior —
    D6.7 does not apply to it (only to prologue recipe ops)."""
    tl = TLContext(pe_id=0, num_programs=1, scratch_base=0x100000)
    a_hbm = _hbm(0x1000, (G, TILE))
    tl.composite(op="math", a=a_hbm, math_op="exp", out_ptr=0x6000)  # no raise